package com.cms.utils.tools;

import java.io.UnsupportedEncodingException;  
import java.security.MessageDigest;  
import java.security.NoSuchAlgorithmException;  
  
/** 
 * 采用MD5加密解密 
 * @author yangtao 
 */  
@SuppressWarnings("unused")
public class MD5Utils {  
  
    /**MD5加密*/
    public static String encrytor(String inStr) throws Exception{  
        MessageDigest md5 = MessageDigest.getInstance("MD5");  
        char[] charArray = inStr.toCharArray();  
        byte[] byteArray = new byte[charArray.length];  
        for (int i = 0; i < charArray.length; i++)  
            byteArray[i] = (byte) charArray[i];  
        byte[] md5Bytes = md5.digest(byteArray);  
        StringBuffer hexValue = new StringBuffer();  
        for (int i = 0; i < md5Bytes.length; i++){  
            int val = ((int) md5Bytes[i]) & 0xff;  
            if (val < 16)  hexValue.append("0");  
            hexValue.append(Integer.toHexString(val));  
        }  
        return hexValue.toString();  
    }  
    
    /**MD5解密 */   
    public static String decrypts(String inStr){  
    	return decrypt(decrypt(inStr));
    }
  
  
    /**加密解密算法 执行一次加密,两次解密  */   
    public static String decrypt(String inStr){  
        char[]  hexValue = inStr.toCharArray();  
        for (int i = 0; i < hexValue.length; i++){  
        	hexValue[i] = (char) (hexValue[i] ^ 't');  
        }  
        return new String(hexValue);  
    }  
    
    public static void main(String[] args) throws Exception {
    	 String s = new String("123456");  
         System.out.println("原始：" + s);  
         System.out.println("MD5后：" + encrytor(s));  
         System.out.println("解密的：" + decrypts(s));  
	}
}  
